what is the biological difference between a righty and lefty?
2006-12-20 11:56:29 · 8 answers · asked by phatso 4 in Science & Mathematics ➔ Other - Science
Handedness is determined while still in the womb. There is no known reason why, a fetus chooses one hand over the other, but whichever hand they use to suck their thumbs for the first time, that is what they'll be during their life.
2006-12-20 12:12:33 · answer #1 · answered by cozmik_terra 2 · 1⤊ 0⤋
My anatomy teacher tried to explain this to my class recently.
Alot of lefties had a twin at one point--an identical twin, that died early in the pregnancy and either dissolved or was "eaten" by the other baby (yes...eaten). These babies were, at one point, mirror images of each other, like putting your hands together, they playing them out, putting the pinkies away from each other. That sort of mirror image.
There is no other difference in the genetic make-up, as far as I know, that distinguished a lefty from a righty.
2006-12-20 20:02:51 · answer #2 · answered by Anonymous · 0⤊ 1⤋
I don't know if I was supposed to even be a lefty, as it usually skips a generation. Yet, my mum, myself and my daughter, 3 generations of females in a row, are all left handed! My mum's grandmum on her mums side was a lefty as well.
2006-12-20 21:54:23 · answer #3 · answered by left handed math geek 1 · 0⤊ 0⤋
a person is usually a lefty because that is how they are raised. If you teach your child to be a lefty, he or she will become a lefty. Most parents teach kids with their right hands because it is a common belief that lefties are seen as evil (as in Islam, muslims must do the vast majority of their actions with their right hands).
2006-12-20 20:04:39 · answer #4 · answered by ravensfan172003 3 · 0⤊ 2⤋
Brain hemisphere dominance. A right handed is left hemisphere dominant while a lefty is a right hemisphere dominant.
2006-12-20 20:01:19 · answer #5 · answered by Milla 2 · 1⤊ 0⤋
Left or right handedness is determined by a gene in the DNA. IOW, it is inherited.
2006-12-20 20:06:18 · answer #6 · answered by Anonymous · 1⤊ 0⤋
They use different sides of their brain.. which makes them use there LEFT hand or there RIGHT one
2006-12-20 20:04:19 · answer #7 · answered by starbucks lover 1 · 0⤊ 0⤋
Biologicaly there is no diffrence.
This question can only be answered by the one who
created us.
2006-12-20 19:59:57 · answer #8 · answered by Rocker#12 1 · 0⤊ 1⤋